If you’re like us there’s a reason you’re not using your old-style wind jacket more. With waterproof jackets like the Idro being lighter and more compact than ever Castelli felt it was time to reinvent a classic. In reality the Aria Shell Jacket is very different from your flappy old jacket that either didn’t protect you or didn’t breathe. This jacket is an impossibly light layer that keeps the wind off the front of your body while allowing ample breathability through the mesh side panels. But what you’ll really appreciate is how the stretch panels in the sides and on the back of the sleeves make this jacket fit like a second skin no flapping fabric no cold air circulating inside the jacket no more looking like a throwback to the Armstrong era.